Fig. 4
C2 and 12C13C emission lines corresponding to the (2,1) bandhead. Some NH2 emission lines also appear in this region. They have been fitted with ad hoc intensities. The 12C13C fit corresponds to a 12C/13C ratio of 80. To improve the signal-to-noise ratio, the intensities have been averaged on 0.03 Å spectral bins. The (2,1) 12C13C bandhead appears clearly at 4722.8 Å.
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